Tool-dressing device



Patented J 11116 14 C. G. OLSON. TOOL DRESSING DEVFCE. APPLICATION FI'LED MAR. 20, 1919.

C. G. OLSON.

TOOL DRESSING DEVICE.

APPLICATION FILED MAR. 20, 1919.

jam? or Q/Z 019m 5; (9421M @M Patented June 14, 1921.

UNITED STATES v PATENT OFFICE.

CARL Gr. OLSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO ILLINOIS TOOL WORKS, OF 7 CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

TOOL-DRESSING DEVICE.

Specification of Letters Patent. Patented J 14 1921 Application filed March 20, 1919. Serial No. 283,748.

No. 1,193,049, issued August 1, 1916. My

present invention is somewhat more applicable to the dressing of grinding wheels than grinding points and in the form illustrated constitutes an attachment for machines such as shown in my pending application filed February 7, 1919, Serial Nof 275,537. As a result of my present invention it is possible to dress the grinding wheel without removing it from the hob grinding machine which said pending application describes.

I accomplish my objects by the mechanism illustrated in the accompanying drawings in which- Figure ,1 is a plan view of the device shown in position upon a hob grinding machine such as shown in said application.

Fig. 2 is an elevation of the parts shown in Fig. 1. The table and slide are shown in vertical section.

Fig. 3 is a perspective view of the device showing the same attached to the grinding machine.

Fig. 4 is a vertical sectional view on the line M, Fig. 1.

Fig. 5 is a vertical sectional view on the line 55, Fig. 1.

Like numerals denote like parts throughout the several views.

I do not herein claim anything shown in my aforesaid pending application; consequently it will be sufficient for the present to say that in the form selected to illustrate the invention the grinding wheel 1 which is to be dressed is mounted upon a spindle (not shown) journaled in a frame 3 and driven by a pulley 4. The frame 3 is mounted upon a stationary pedestal 5 in such manner that said frame may be turned over loosely connected to the table.

about a horizontal axis from one horizontal position to another, the purpose being to reverse the position of the grinding-wheel is explained in said co-pending applica- 101.1.

Referring now more particularly to the parts concerned with the present invention, a base or table 10 is adapted to be secured to the pedestal 5 of the hob grinding machine by means of studs 11, 11 or other suitable fastening elements. In order to make the table adjustable upon the pedestal, I form slots 12, 12 in the table for accommodating the shanks of the studs.

A templet 14 is secured to and is preferably integral with a cross-slide 15 which slides upon table 10 and is adapted to be ad justed by means of opposed adjusting screws 16. The cross-slide 15 is shown in section in Fig. a, which figure also showing a stud 1'?" working in a slot 18 in the cross-slide for holding the cross-slide to the table 10.

A plate 20 rests upon said table and constitutes a slide for supporting the parts which cooperate with the templet and the grinding wheel, as hereinafter explained. The plate 20 is loosely connected to table 10 at the rear end, preferably by means of an Lip-standing pin 21 which makes a drive fit with the table as illustrated in detail in Figs. 2 and 5. The upper end of the pin rises somewhat above the upper surface of the table so as to project into a slot 22 extend ing longitudinally in plate 20. As a result of this construction the forward end of the plate is free to slide in all directions upon table 10, but the rear end of the plate is At the forward end of the plate there is formed an integral upstanding cone 25 which fits into a correspondingly tapered socket 26 formed in an arm 27 which carries the dressing tool 28. The arm is held down tight on the cone by means of a screw 30 which has a collar 31 near its lower end which engages the underside of plate 20. A cap 32 screws onto the upper end of screw 30. This permits the arm to be adjusted angularly about the axis of screw 30, the purpose being to making it possible to hold the dressing tool always at right angles to the face of the grinding wheel. The screw 30 carries a guide pin 33 at its lower end which is adapted to follow the working edge of the templet 14.

The dressing tool is secured to thelower end of arm 27 by suitable means as for example by forming a split'boss 35 at the lower end of the arm which may be tightened upon the tool by means of a clamping screw 36. I r

In the preferred form the dressing tool is held at an oblique angle in the arm so that when-viewed in one direction (in the present case from the side) it will present an oblique angle to the face of the grinding wheel. The advantage in this is that when the diamond point wears, a fresh sharp edge may be presented to the grinding wheel by rotating the dressing tool angularly about its own longitudinal axis. However, I do not herein claim the idea of presenting the dressing tool obliquely to the surface to be dressed as this is claimed in the aforesaid copending application.

In operation, let it be assumed that the grinding wheel is mounted in a hole grinding machine in which, of course, the grinding wheel is capable of being rotated at high speed. W hen the grinding wheel has become out of true, my device is brought into action by first adjusting thebase or table 10 to the pedestal 5 and clamping it in proper position by means of the studs ll, 11. The templet 14 is then adjusted by suitably manipulating'the adjusting screws 16, 16. The plate 20 is then placed upon the table 10 and the arm 27 adjusted angularly about the axis of screw 30 in such manner that the dressing tool 28 will lie in a vertical plane perpendicular to the acting surface of the grinding wheel. The grinding point is then caused to move across the face of the grinding wheel by the operator, who grasps the cap 32 in one hand and the cap 88 in the other and causes the pin 33 to follow the working edge of the templet. lVhen the operation is completed, the attendant first lifts off plate 20 which brings with it the arm 27, and the dressing tool 28. He then unscrews the studs 11, 11 whereupon the base or table 10 may be lifted off the ped esta-l 5, and the hob grinding machine is" ready to proceed with its work.

From the foregoing description it will be evident that it is a very simple matter to place or remove the device which forms the subject of my present application. In the first pla'ce,-the plate 20 is not actually attached to the base or table 10 but simply lics' upon it and is free to slide in all directions except that the rear end is loosely connected by means of the pin 21 and slot 22. As the plate is so easily removable it becomes a simple matter to adjust the device because the plate and dressing tool will be out of the way when the table 10 is being adjusted. Hence my device may be applied to the hob grinding machine with ease at any time that the grinding wheel needs truing. Consequently the attendant will be more apt to keep the grinding wheel in proper-shape. In actual-practice the table 10 is usually left on the hob grinding machine, for it is not in the way under ordinary circumstances; consequently all that usually has to be done to apply the mechanism is to merely base 10.

It will be observed that by properly adjusting the dressing tool longitudinally in the arm, the diamond point of the tool may be brought into line with the axis of the guide pin 'lVhen thus adjusted, the configuration produced in the grinding wheel will be in all respects like the configuration of'the working edge of the templet.

It will also be noted that in the design illustrated if the axis of the guide pin 33 were produced or, extended downward. it would pass through the point of the dressing tool, or approximately so, or if not the actual, point, the axis of it or the axis if extended or produced. In other words, the axis of the guide. pin and the axis of the dressing tool are coincident with lines which would intersect, or approximately so, if suf ficiently extended-or produced.

Attention is called to my application filed on even date herewith for tool dressing device, Serial Number 283,733.

"Having thus described my invention wl I claim as new and desire to secure by Letters Patent, is

1. A. dressing tool having a base provided with a flat bearing surface, atemplet idly connected to said base, a slide bearing upon said bearing surface, a dressing tool carried at the front end of the slide, and a slot and pin connection between the rear end of the slide and the base, whereby the rear end of the slide is free to rotate about the pin as an axis and to slide lengthwise of the slot, the front end of the slide having a part adapted to'engage and follow the templet. 1

2. A dressing tool having abase provided with a flat guide surface, a templet rigidly connected to said base, a slide bearing upon said guide surface, a dressing tool carried by said slide, a pin carried by said slide near the dressing tool and adapted to follow the templet for guiding the dressingtool, said slide being anchored to the base at a point distant from the templet, the portion of the slide which is near the templet being movable in all directions upon said guide surface.

3. A dressing tool having a base provided with a flat guide surface, a templet rigidly connected to said base, slide bearing upon said guide surface, one portion of the slide being free to move in all directions upon said guide surface, means for holding said slide in contact with said guide surface, a

place'the plate 20 on the dressing tool carried by the free-moving portion of said slide, and a pin on the free-moving portion of said slide adapted to follow the templet.

4. A tool dressing device having a table, a templet arranged in the plane of the table, a plate slidable upon the table, one end of the plate having a slot and pin connection with the table, and the other end of the plate having a guide pin adapted to follow the templet, a work carrier located beneath the plane of the table, and a depending arm suspended from the plate and carrying at its lower end a dressing tool for acting upon the work.

5. A tool dressing device having a table, a templet attached to the table, a slide m0vable upon the table, a guide pin attached to the slide for following the templet, a dressing tool, and an arm carrying the dressing tool, said arm being mounted upon the slide and being angularly adjustable about an axis perpendicular to the plane of the table.

6. A tool dressing device havinv a base, a templet attached to the base, a slide mounted on the base, a pin carried by the slide and adapted to follow the templet, a dressing tool, and an arm for carrying the dressing tool, the arm and the slide having a cone and socket connection, and a screw for tightening the cone in the socket to thereby rigidly hold the parts in the position to which they are adjusted.

7. A tool dressin device having a table, arranged horizontally, and a horizontally arranged templet attached to it, a plate one end of which is freely slidable upon the table and the other has a slot and pin connection with said table, a guide pin fastened to the plate and adapted to follow the templet, an upstanding cone formed at the free end of the plate, a tool carrying arm having a socket fitting over the cone, and means for clamping the socketed arm down tight upon the cone.

8. A tool dressing device having a table, a templet attached to the table, a plate slidable upon the table, a guide pin fastened to the plate and adapted to follow the templet, an arm carried by the plate and arranged parallel to the guide pin, a dressing tool carried by the arm, and extending in such direction that its produced axis would intersect the produced axis of the guide pin.

9. A tool dressing device having a table, a templet attached to it, a plate slidable upon the table, a guide pin fastened to the plate and adapted to follow the templet, and an arm arranged parallel to the axis of the guide pin, and angularly adjustable with respect to the axis of the guide pin, and a dressing tool, the axis whereof lies in a vertical plane passing through the axis of the guide pin.

10. A tool dressing device having a table, a templet attached to the table, a slide mounted upon the table, a dressing tool, an arm carried by the slide and adapted to support the dressing tool, a guide pin adapted to follow the templet, the arm being angularly adjustable upon the slide about the axis of the guide pin, and means for securing the guide pin to the slide and simultaneously tightening the arm to the slide.

In witness whereof, I have hereunto subscribed my name.

CARL G. OLSON. 

